A 861 v4.x has standard a IE42
It is useless without one. Al the input signal passes through one.
The listed IE16 is the card from the older versions. I think only IE42 can do MHR smart link.
Also if you have your 861 upgraded from 2.x to 3.x you already get the OA02 converted to a OA02m. Newer unit, or person who does not care about cost would have the newer OAx3 cards.

It looks more like a v2.x 861 this way than a v4.1
Why would you go through expensive upgrade and sell of immediatly ?

The costs for upgrade are (dutch pricelist in Euro)
v2.x -> v3.x
861 V3 up-grade serialnr. below 100250 return to Meridian 3.795,00
861 V3 up-grade kit serialnr. up from 100450 at Viertron TD 2.895,00
Serialnr. 100250 t/m 100450 only at Viertron TD if upgraded with IE 16

v3.x -> v4.x
861 V4 up-grade kit V3 only for 861 V3 645,00

v2.x -> v4.x
861 V4 up-grade serialnr. below 100250 return Meridian 4.200,00
861 V4 up-grade kit serialnr up from 100450, no restriction 3.350,00


In basic:
upgrade from 2.x -> 3.x:
IE16 out, IE42 in
Z300 DSP card swapped for CD20
OAx2 upgraded to OAx2m or swapped for OAx3

upgrade from 3.x -> 4.x
AB00 DSP swapped for EF20


To answer your question:
what does a IE42 cost:
not clear, that seems to come only with an upgrade(v2.x-v3.x or v2.x to v4.x). It needs the CD20 to work i guess. Those 2 together (in a upgrade) is around 2800 Euro in Holland.

Sold all M equipment